improve alert-query utf-8 support
improve alert-query utf-8 support

guardian/alerta,guardian/alerta,0312birdzhang/alerta,guardian/alerta,mrkeng/alerta,0312birdzhang/alerta,skob/alerta,skob/alerta,skob/alerta,guardian/alerta,mrkeng/alerta,mrkeng/alerta,0312birdzhang/alerta,skob/alerta,mrkeng/alerta